Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.34 as permitted sender) client-ip=23.128.96.34;
Date:   Fri, 15 Dec 2023 00:55:08 +0800
From:   Jianhua Lu <lujianhua000@gmail.com>
To:     Mark Brown <broonie@kernel.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        Banajit Goswami <bgoswami@quicinc.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>, alsa-devel@alsa-project.org,
        linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/4] ASoC: qcom: common: Add qcom_snd_tdm_hw_params
 function
Message-ID: <ZXszbA5fVq2AMjEb@Gentoo>
References: <20231213123556.20469-1-lujianhua000@gmail.com>
 <7b13b8b6-9048-48a3-b1a1-e62de88e8171@sirena.org.uk>
 <ZXsklsO7nOqBFgzt@Gentoo>
 <bee0ab28-6bd3-4904-8afc-44fe7ddacb79@sirena.org.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <bee0ab28-6bd3-4904-8afc-44fe7ddacb79@sirena.org.uk>
Precedence: bulk

On Thu, Dec 14, 2023 at 03:56:52PM +0000, Mark Brown wrote:
> On Thu, Dec 14, 2023 at 11:51:50PM +0800, Jianhua Lu wrote:
> > On Thu, Dec 14, 2023 at 11:11:06AM +0000, Mark Brown wrote:
> 
> > > The expectation is that TDM is set up by the machine driver, not from
> > > hw_params - if the TDM setup can be changed from within hw_params then
> > > it's hard to see how it's going to interact well with other TDM users on
> > > the bus.  More usually hw_params() would be influenced by the setup done
> > > in set_tdm_slot().
> 
> > Currently, qcom TDM setup need to read hw_params, if we want to move it
> > to machine driver, we must hardcode some params, but it will reduce reduce
> > readability.
> 
> What makes you say that TDM setup needs to read hw_params?

qcom_snd_tdm_hw_params function read PCM_FORMAT to set slot_width value, read
channels to set rx_mask value.